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Magnetic Effects of Electric Current — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMagnetic Effects of Electric Current1 Mark
Question
In the followin questions, a statement of Assertion is given by to corresponding statement of Reason. Of the statement mark the correct answer as:
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
  3. If Assertion is true, but Reason is false.
  4. If Assertion is false, but Reason is true.
  5. If Assertion and Reason both are false.
Assertion: In an AC generator slip-rings type of commutator is used.
Reason: Slip-rings are full rings with which the ends of coil are in contact.
✓

Answer

  1. If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

Explanation:

The two parts S1 and S2 of the split ring are used to act as a commutator to reverse the direction of current in the coil, so they are called the split ring commutator. So, slip rings are used with simple a.c. generators, whereas a commutator is used with d.c. motors.

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